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Tompkins Slavery and Succession The 13 colonies that made up the original United States developed differently due to political differences and geographic differences. The northern states became centers for business while the southern states developed large farms called plantations. The South’s economy was based on cash crops and textiles grown on plantations that used slavery. The North and South disagreed about slavery. Many Northerners were abolitionists who supported a tariff that would hurt the South. The United States continued to expand westward. The idea of manifest destiny clashed with slavery. The Kansas-Nebraska Act allowed new territories to decide for themselves about slavery. But, the Fugitive Slave Act was passed that required slaves be returned to their owners. The states argued with the US government about states’ right to secede from the country. Many Southern states, including Texas voted for succession. Then, the seceded states became known as the Confederate States of America and they fought against the United States in the Civil War.